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cifs: protect session status check in smb2_reconnect()

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commit 5bff9f741af60b143a5ae73417a8ec47fd5ff2f4 upstream.

Use @ses->ses_lock to protect access of @ses->ses_status.

Cc: stable@vger.kernel.org
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paulo Alcantara 2023-04-27 16:07:38 -03:00 committed by Greg Kroah-Hartman
parent 64d62ac6d6
commit e4a37e9060
1 changed files with 11 additions and 4 deletions
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15
fs/cifs/smb2pdu.c
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@ -175,8 +175,17 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
}
}
spin_unlock(&tcon->tc_lock);
if ((!tcon->ses) || (tcon->ses->ses_status == SES_EXITING) ||
(!tcon->ses->server) || !server)
ses = tcon->ses;
if (!ses)
return -EIO;
spin_lock(&ses->ses_lock);
if (ses->ses_status == SES_EXITING) {
spin_unlock(&ses->ses_lock);
return -EIO;
}
spin_unlock(&ses->ses_lock);
if (!ses->server || !server)
return -EIO;
spin_lock(&server->srv_lock);
@ -204,8 +213,6 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
if (rc)
return rc;
ses = tcon->ses;
spin_lock(&ses->chan_lock);
if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
spin_unlock(&ses->chan_lock);